一道动名词的问题 --what has made you so upset?--______my pet cat.

问题描述:

一道动名词的问题 --what has made you so upset?--______my pet cat.
是Losing 还是Because of losing
为什么?

losing.what提问回答应为名词或者动名词,losing为动名词,而because需要和why合用